This riddle asks: What can go up a hill and down a hill without moving?
The answer is: a road.
A road can run up one side of a hill and down the other while remaining completely fixed in place. It does not travel anywhere itself; people and vehicles travel along it.
The trick is the phrase “go up” and “go down.” Those words usually describe movement, but they can also describe the direction or shape of something that stays still.
Once you picture a winding road following the slope of a hill, the answer makes perfect sense. The road goes up and down, but it never moves.
